Internal and external milling



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R 2 3720913 0 2 s I W W P 1945. J. M. SCHMIDT 2,372,913

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Patented Apr. 3, 1945 Search R001 INTERNAL AND EXTERNAL MILLINGATTACHMENT James M. Schmidt, Philadelphia, Pa.

Application May 14, 1943, Serial No. 487,013

1 Claim.

The present invention relates to new and useful improvements in millingattachments and the principal object of the invention is to provide aninternal and external milling attachment for making keyways and the likeand to face light work.

Another important object of the invention is to provide a millingattachment which can be readily attached to any machine that has arotating spindle such as horizontal boring mills, lathes, and drillpresses.

An important object of the present invention when associated with one ofthe machines above named is the advantage of direct alignment with thetaiistock, thus eliminating the change for error in set up andoperation, this is especially true when the device is used on lathes orhorizontal boring mills.

Other objects and advantages of the invention will become apparent tothe reader of the following description.

In the drawings:

Figure 1 represents a fragmentary side elevational view showing theappliance acting on a piece of work, the latter being shown in section.

Figure 2 is a top plan view of the attachment.

Figure 3 is a section on the line 33 of Figure 5.

Figure 4 is a fragmentary bottom plan view of the attachment.

Figure 5 is a fragmentary longitudinal sectional view.

Figure 6 is a cross section on the ine 6-6 of Figure 1.

Referring to the drawings wherein like numerals designate like parts, itcan be seen that numeral 5 denotes a tailstock through which a bar 6 issliclable and splined to the tailstock 5 is the bar 6 having a groove 1therein for receiving 9. lug (not shown) in the tailstock.

A tapered shank 8 projects from the bar 6 and on to this is adapted tobe wedged, a tapered socket 9 projecting from one end of the attachmentIII which makes up the present invention.

Numeral H denotes a boring head from which projects conventionalmechanism l2, this including a shaft l3 having a tapered socket or chuckfor receiving a tapered shank H which represents part of the presentinvention.

More specifically the attachment l consists of a case l having thesocket 9 at one end thereof and a bearing box l6 at its opposite end inwhich are bearing assemblies IT, 18 through which a shaft i9 is disposedand from which projects the tapered shank H.

The inner end of the shaft I9 has a beveled gear 20 which meshes with abeveled gear 2| located on a hollow countershaft 22, the upper end ofthis countershaft being reduced as at 23 and disposed through a bearingassembly 24 located in a pocket 25. The pocket 25 has a removable coverplate 26 to permit access to a nut 26a on the upper end of the shaft 22,as when it is desired to remove the shaft 22 from the case 15. Further,asecond pocket 21 is provided at the lower portion of the case l5 andthis contains a bearing assembly 28 held in place by a removable cover29, and as is shown in Figure 5, the lower reduced end of thecountershaft 22 depends through the bearing assembly 28 and through thecover 29, where it is provided with a nut 30.

An end mill 3| has a tapered shank 32 which is disposed into the hollowshaft 22 and is threaded at its upper end to receive a screw 32a, thehead portion of which seats in a countersink at the upper end of theshaft 22.

A drain plug l5a is provided in the bottom of the case l5, and, ofcourse, suitable belt rings or washers can be employed in conjunctionwith the bearing assemblies 24 and 28.

Obviously, when the drill is in operation, the gears 20, 2| are operatedand the end mill 3| rotated into the work.

Figure 1 shows a cylinder A or like structure in which a keyway B isbeing milled by the end mill 3|.

Obviously, when the drill head has been removed from the attachment, theattachment can readily be removed from the tapered shank 8 (see Figure5) by simply inserting a tool or the like into a slot 33 in the socket 9and exerting a slight force against the adjacentend of the shank 8.

While the foregoing specification sets forth the invention in specificterms, it is to be understood that numerous changes in the shape, sizeand materials may be resorted to without departing from the spirit andscope of the invention as claimed hereinafter.

Having described the invention, what is claimed as new is:

In a machine of the class described, the combination with a tail stockand a chuck-carrying head stock, of a tapered shank mounted in said tailstock to extend horizontally therefrom, a closed casing interposedbetween said shank and chuck and having a tapered socket extending fromone side thereof and wedged onto said shank, a. horizontal shaftextending from said chuck into the opposite side of said casing, avertically disposed hollow countershaft rotatably mounted in said casingto extend out of the bottom of the same, a milling tool secured in saidcountershai't to depend therefrom, and bevel gearing in said casingoperatively connecting the horizontal shaft to the countershaft.

JAMES M. SCHMIDT.

